/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.iotdb.db.protocol.rest.handler;

import org.apache.iotdb.commons.exception.IllegalPathException;
import org.apache.iotdb.commons.path.PartialPath;
import org.apache.iotdb.db.exception.WriteProcessRejectException;
import org.apache.iotdb.db.mpp.plan.statement.crud.InsertTabletStatement;
import org.apache.iotdb.db.protocol.rest.model.InsertTabletRequest;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.utils.Binary;
import org.apache.iotdb.tsfile.utils.BitMap;

import java.nio.charset.StandardCharsets;
import java.util.List;
import java.util.Locale;

public class StatementConstructionHandler {
    private StatementConstructionHandler() {
    }

    public static InsertTabletStatement constructInsertTabletStatement(
            InsertTabletRequest insertTabletRequest)
            throws IllegalPathException, WriteProcessRejectException {
        // construct insert statement
        InsertTabletStatement insertStatement = new InsertTabletStatement();
        insertStatement.setDevicePath(new PartialPath(insertTabletRequest.getDevice()));
        insertStatement.setMeasurements(insertTabletRequest.getMeasurements().toArray(new String[0]));
        List<List<Object>> rawData = insertTabletRequest.getValues();
        List<String> rawDataType = insertTabletRequest.getDataTypes();

        int rowSize = insertTabletRequest.getTimestamps().size();
        int columnSize = rawDataType.size();

        Object[] columns = new Object[columnSize];
        BitMap[] bitMaps = new BitMap[columnSize];
        TSDataType[] dataTypes = new TSDataType[columnSize];

        for (int i = 0; i < columnSize; i++) {
            dataTypes[i] = TSDataType.valueOf(rawDataType.get(i).toUpperCase(Locale.ROOT));
        }

        for (int columnIndex = 0; columnIndex < columnSize; columnIndex++) {
            bitMaps[columnIndex] = new BitMap(rowSize);
            switch (dataTypes[columnIndex]) {
                case BOOLEAN:
                    boolean[] booleanValues = new boolean[rowSize];
                    for (int rowIndex = 0; rowIndex < rowSize; rowIndex++) {
                        Object data = rawData.get(columnIndex).get(rowIndex);
                        if (data == null) {
                            bitMaps[columnIndex].mark(rowIndex);
                        } else {
                            if ("1".equals(data.toString())) {
                                booleanValues[rowIndex] = true;
                            } else if ("0".equals(data.toString())) {
                                booleanValues[rowIndex] = false;
                            } else {
                                booleanValues[rowIndex] = (Boolean) data;
                            }
                        }
                    }
                    columns[columnIndex] = booleanValues;
                    break;
                case INT32:
                    int[] intValues = new int[rowSize];
                    for (int rowIndex = 0; rowIndex < rowSize; rowIndex++) {
                        Object object = rawData.get(columnIndex).get(rowIndex);
                        if (object == null) {
                            bitMaps[columnIndex].mark(rowIndex);
                        } else if (object instanceof Integer) {
                            intValues[rowIndex] = (int) object;
                        } else {
                            throw new WriteProcessRejectException(
                                    "unsupported data type: " + object.getClass().toString());
                        }
                    }
                    columns[columnIndex] = intValues;
                    break;
                case INT64:
                    long[] longValues = new long[rowSize];
                    for (int rowIndex = 0; rowIndex < rowSize; rowIndex++) {
                        Object object = rawData.get(columnIndex).get(rowIndex);
                        if (object == null) {
                            bitMaps[columnIndex].mark(rowIndex);
                        } else if (object instanceof Integer) {
                            longValues[rowIndex] = (int) object;
                        } else if (object instanceof Long) {
                            longValues[rowIndex] = (long) object;
                        } else {
                            throw new WriteProcessRejectException(
                                    "unsupported data type: " + object.getClass().toString());
                        }
                    }
                    columns[columnIndex] = longValues;
                    break;
                case FLOAT:
                    float[] floatValues = new float[rowSize];
                    for (int rowIndex = 0; rowIndex < rowSize; rowIndex++) {
                        Object data = rawData.get(columnIndex).get(rowIndex);
                        if (data == null) {
                            bitMaps[columnIndex].mark(rowIndex);
                        } else {
                            floatValues[rowIndex] = Float.valueOf(String.valueOf(data));
                        }
                    }
                    columns[columnIndex] = floatValues;
                    break;
                case DOUBLE:
                    double[] doubleValues = new double[rowSize];
                    for (int rowIndex = 0; rowIndex < rowSize; rowIndex++) {
                        if (rawData.get(columnIndex).get(rowIndex) == null) {
                            bitMaps[columnIndex].mark(rowIndex);
                        } else {
                            doubleValues[rowIndex] =
                                    Double.valueOf(String.valueOf(rawData.get(columnIndex).get(rowIndex)));
                        }
                    }
                    columns[columnIndex] = doubleValues;
                    break;
                case TEXT:
                    Binary[] binaryValues = new Binary[rowSize];
                    for (int rowIndex = 0; rowIndex < rowSize; rowIndex++) {
                        if (rawData.get(columnIndex).get(rowIndex) == null) {
                            bitMaps[columnIndex].mark(rowIndex);
                            binaryValues[rowIndex] = new Binary("".getBytes(StandardCharsets.UTF_8));
                        } else {
                            binaryValues[rowIndex] =
                                    new Binary(
                                            rawData
                                                    .get(columnIndex)
                                                    .get(rowIndex)
                                                    .toString()
                                                    .getBytes(StandardCharsets.UTF_8));
                        }
                    }
                    columns[columnIndex] = binaryValues;
                    break;
                default:
                    throw new IllegalArgumentException("Invalid input: " + rawDataType.get(columnIndex));
            }
        }

        insertStatement.setTimes(
                insertTabletRequest.getTimestamps().stream().mapToLong(Long::longValue).toArray());
        insertStatement.setColumns(columns);
        insertStatement.setBitMaps(bitMaps);
        insertStatement.setRowCount(insertTabletRequest.getTimestamps().size());
        insertStatement.setDataTypes(dataTypes);
        insertStatement.setAligned(insertTabletRequest.getIsAligned());
        return insertStatement;
    }
}
